TOI-5916 b
TOI-5916 b is a hot Jupiter orbiting the M2±0.5 star TOI-5916 in the constellation Pegasus. It lies about 651 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-5916 b?
TOI-5916 b has a radius of 11.35 times that of Earth, or 1.01 times the radius of Jupiter. Its mass is 227 times that of Earth, giving it a density of 0.86 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5916 b in the Habitable Zone?
TOI-5916 b orbits inside the inner edge of the habitable zone of TOI-5916. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5916: 0.153–0.396 AU (conservative: 0.194–0.375 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5916 b
The equilibrium temperature of TOI-5916 b is about 683 K (410 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 51.70 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5916 b — one full orbit around TOI-5916 — lasts 2.37 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.026 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-5916 b Discovered?
TOI-5916 b was discovered in 2026 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is TOI-5916 b?
TOI-5916 b is 651.4 light-years (199.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1375. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,464,640 years to make the journey.
The Host Star: TOI-5916
TOI-5916
- Spectral type
- M2±0.5
- Surface temperature
- 3,613 K (Sun: 5,772 K)
- Mass
- 0.48 M☉
- Radius
- 0.48 R☉
- Luminosity
- 0.0353 L☉
- Age
- 5.0 billion years (Sun: 4.6)
Planetary System
TOI-5916 b is the only planet known to orbit TOI-5916 so far.
TOI-5916 b — Complete Data
| Radius | 11.355 Earth radii (1.013 Jupiter radii) |
|---|---|
| Mass | 226.61 Earth masses (0.713 Jupiter masses) |
| Density | 0.86 g/cm³ (Earth: 5.51) |
| Orbital period | 2.37 days |
| Orbital distance | 0.026 AU |
| Eccentricity | 0.090 |
| Equilibrium temperature | 683 K (410 °C) |
| Stellar irradiation | 51.70× Earth |
| Distance from Earth | 651.4 light-years (199.7 parsecs) |
| Constellation | Pegasus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-04-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5916 b
Is TOI-5916 b habitable?
No — TOI-5916 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5916 b?
TOI-5916 b is about 651 light-years from Earth in the constellation Pegasus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,464,640 years to get there.
How big is TOI-5916 b compared to Earth?
TOI-5916 b has 11.35 times the radius of Earth and about 227 times its mass.
How long is a year on TOI-5916 b?
One orbit around TOI-5916 takes 2.4 Earth days — short enough that 154 of its years would fit into one Earth year.
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